Air-pump



R. C. ZANNOTH.

\ AIR PUMP. APPLICATION FILED JULY 12, 19l9.

1 ,398, 3-1 0. I Patented Nov. 29; 1921.

V aftermat ROBERT C. ZANNOTH, 0F MILTVAUKEE, WISl'iIOll'SITlT, ASSTGNGR T0 ROBERTS BRASS COMPANY, 05 MILWAUKEE, "WISCONSIN, COBPQRATION OF WISCONSIN.

AIR-PUMP.

Application filed July 12,

To all whom it may concern:

Be it known that T, ROBERT C. ZANNOTH, a citizen of the United States, residing at lllilwaukee, county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Air-Pumps, of which the following is a specification;

My invention relates to improvements in air pumps. I

The object of my invention is to provide means whereby air may be admitted to the pump without passing the cup leather, in such a manner as to separate the cup leather from the inner surface of the pump cylinder; also to provide a controlling valve which will readily admit air to the cylinder during the upward movement of the piston, but will efiectually prevent the escape of air during the compression stroke, said valve being so located that its efficiency will not be impaired by contact with the lubricant employed to keep the cup leather flexible; also to provide a form of construction having maximum durability and efficiency, with minimum cost of manufacture.

In the drawings Figure 1 is a vertical sectional view of my improved pump.

Fig. 2 is a cross sectional view, drawn on line 2-2 of Fig. 1.

Fig. 3 is a view of the lower end of the pump cylinder with the base removed to show the valve and its retaining ring in associated relation to the piston, a portion of the valve and piston head being partially bro-ken away.

Like parts are identified by the same reference characters throughout the several views.

The cylinder 1 of my improved pump is secured to the base 2 in any ordinary manner, the joint being preferably brazed or welded. A tubular piston rod 8 passes through the cap a at the upper end of the cylinder, and is provided with a handle 5. The piston head 6 is secured to the lower end of the piston rod, and is provided with a cup leather 7, held in position by a clamping disk Sand nut 9, the latter being threaded on the upwardly projecting sleeve portion 10 of the piston head.

The piston head is provided with a downturned annular flange 12, having a channel in its inner face adapted to receive a split ring Specification of Letters Patent.

iateiited Nov. 29., i921.

1919. Serial No. 310,482.

l 3.formed of resilient material, the end p0rtrons of which are bent inwardly to forma set of valve supporting arms 15 and 16, proj6Ct-ll1g divergently across the central portion of the space inclosed by the down-turned flange 12. These armssupport a disk valve 17, adapted to seat upwardlyagainst an annular head or flange 18, on the under surface of the head 6, this flange being concentric w th the outlet of the passage 20 in the p ston rod3. Near the upper end of the piston rod, it is provided with one or more apertures 22.

During the-upward movement of the piston, air is admitted through the apertures 22, and passes downwardly through the longitudinal passage 20 in the piston rod, the valve 17 beingin open position, and supported on the arms 15 and 16 carried by the split ring 13. Gn the return stroke of the piston, valve 17 will be lifted by the air in the lower portion of the cylinder, and pushed against its seat, 2'. 6., the bead 18. The surface of this bead will, of course, be faced off or smooth, and the surface of the valve disk 17 will also be smooth, whereby when the valve 17 is lifted, it closes in air-tight relation to the seat 18.

It will be observed that the valve 17 has a diameter that is nearly equal to the diameter of the space inclosed by the piston head flange 12. Therefore, when the piston moves downwardly,the valve 17 will be almost instantly lifted to closing position, if the movement of the piston is at normal speed, or at any ordinary operating speed. Therefore, on the down stroke the air will be forced through the outlet 24: in the base 2. No valve is shown at the outlet, for the reason that pumps of the described class are usually connected with small ducts, or lengths of rubber hose, provided with a valve, or a coupling to connect with a valved nipple, such, for example, as the inlet nipple of a pneumatic tire. It is therefore not material to the struc- When the ring is thus withdrawn, the valve 17 can be readily removed or permitted to drop from within the cylinder head.

I claim 1. An air pump, having in combination a piston head provided with a depending flange, partially inclosed by a cup leather, a

tubular piston rod leading through the piston head, and provided with an air inlet near its upper end, a valve disk loosely supported within the space inclosed by said de pending flange, and adapted to seat upwardly against the piston head, means for supporting the valve in open position, said valve supporting means comprising a re silient member removably anchored to the depending flange, and provided with valve supporting arms.

2. In an air pump, the combination with a pump cylinder, of a piston head having the form of an inverted cup, centrally apertured, and connected with a tubular piston rod anchored in said aperture, a cup leather mounted on the outer surface of said piston head, a disk valve loosely supported within the piston head and adapted to seat upwardly thereon, and a valve seat On the under side of the piston head comprising a depending rib distant from the central aperture and adapted to engage the valve along a narrow zone of contact, whereby during the suction stroke atmospheric air pressure may be exerted upon the valve over an area considerably greater than that of the aperture in the piston rod to promptly force the valve from its seat.

3. In an air pump, the combination with a pump cylinder, of a piston head having the form of an invertedcup, centrally apertured, and connected with a tubular piston rod anchored in said aperture, a cup leather mounted on the outer surface of said piston head, and a disk valve loosely supported within the piston head, and adapted to seat upwardly thereon, the annular outer wall of the piston head being provided with an interior circular channel, and said valve support comprising a resilient open ring seated in said channel with its end portions inturned to valve supporting position.

An air pump comprising a piston having a depending flange, a tubular piston rod attached to said piston and communi cating with the space inclosed by said tubular flange and provided with an air inlet, a

valve disk loosely positioned within said space and adapted to seat upwardly against the piston, and resiliently held means for loosely retaining said valve disk in position.

In testimony whereof I afiix my signature in the presence of two witnesses.

ROBERT C. ZANNOTH.

/Vitnesses:

Lnvnnn'r'r C. WHEELER, O. OpWEBER. 

